A laboratory experiment of magnetic reconnection has been developed in the TS-3 and TS-4 merging devices, using two colliding plasma toroids with cohelicity and counterhelicity. The conventional local 2-D reconnection was extended experimentally to global 3-D reconnections by introducing a new field component Bx parallel to the X-line, a global external force and a reconnection-driven global equilibrium transition. Selective ion heating accompanied by a 3-D field-aligned jet was documented during the counterhelicity reconnection without Bx, indicating its direct energy-conversion into the ion thermal energy. All of ion heating, current-sheet resistivity and reconnection rate increase significantly with decreasing Bx and with increasing external force, indicating three-component and driven features of reconnection. The anomalous sheet-current dissipation and the ion heating are both found to depend on whether the current-sheet is compressed shorter than the ion gyroradius or not.